Fact Sheets And Publications
Fusarium Head Blight
Pest Background
- FHB, or scab, affects wheat, barley, oats, corn, and other grasses.
- Fusarium graminearum (syn. Gibberella zeae) is favored by warm, humid conditions during flowering and early kernel development.
- In addition to yield losses, this fungus produces mycotoxins such as deoxynivalenol (DON) that can accumulate in grain.
Identification
- FHB symptoms include bleached spikelets (Fig 1A) first visible 18-21 days after flowering.
- Spores may be visible on infected spikelets as pink or orange spore masses (Fig 1B).
- Infected grains may shrink and wrinkle, producing tombstone-like kernels which can be pink, gray, and light brown (Fig 2).
Management
- Spikelets are most susceptible at early flowering (Feekes 10.5.1) when anthers emerge. Weather conditions leading up to and following anthesis greatly impact disease development.
- Monitor risk at wheatscab.psu.edu.
- An integrated management approach is best.
- Moderately resistant wheat varieties are available.
- Corn is the most common rotation partner of small grains in the region and a host of F. graminearum. Minimizing corn or wheat residues and rotating to a non-host crop when possible, helps to reduce pathogen survival over winter.
- Fungicides are most effective in reducing FHB and DON when applied at anthesis (Feekes 10.5.1) but may be applied up to 7 days after flowering (Fig 3).
References
Crop Protection Network (2022, January 28). Fusarium Head Blight of Wheat. Retrieved from: https://cropprotectionnetwork.org/ encyclopedia/fusarium-head-blight- of- wheat
Authors: Joseph Cinderella and Dr. Alyssa Koehler
UD Cooperative Extension
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